The dowtherm system has definitely changed over time. I have only been looking into it for a month or so now, but it is apparent the system is being ran more aggressively than designed for (CVs on full flow).
There are currently no vapor traps on the condensate return line, but CVs on the HX...
Current situation: There is an excessive amount of Dowtherm hot oil vapor moving through a heat exchanger, causing pressure in the condensate line and collection tank.
Proposed solution: Place a hot oil vapor trap on the outlet of the heat exchanger to capitalize on latent heat and minimize...
Pete,
Here is the nameplate for the motor.
My first example was worked using roughly the info on the nameplate. The train of thought is that if at a full load of 200 HP the efficiency is rated for 95.4%, then an inequality can be formed to determine the losses (assuming they are all heat)...
To find average heat losses on a motor, it can be quickly determined using the rated HP and efficiency.
EX. A 200 HP @1800 RPM and 95% eff.
200 HP x (1-.95) = 10 HP
10 HP x 2550 = 25,500 BTU/hr
(25,500 BTU/hr) / (12,000 BTU/hr) = 2.125 Tons
But what if the motor is run off a VFD...
